[SystemZ]  Add 'REQUIRES: asserts' to test case using debug output.

llvm-svn: 327766
diff --git a/llvm/test/CodeGen/SystemZ/signbits.ll b/llvm/test/CodeGen/SystemZ/signbits.ll
index 4c019a6..3b92198 100644
--- a/llvm/test/CodeGen/SystemZ/signbits.ll
+++ b/llvm/test/CodeGen/SystemZ/signbits.ll
@@ -2,6 +2,7 @@
 ; DAGCombiner so that it knows that %sel0 is already sign extended.
 ;
 ; RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -debug-only=isel < %s 2>&1 | FileCheck %s
+; REQUIRES: asserts
 
 %0 = type <{ %1*, i16, [6 x i8] }>
 %1 = type { i32 (...)** }